:root{font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{color:inherit;text-decoration:underline}body{margin:0;min-width:320px;min-height:100vh;background:#fff;color:#111827}*{box-sizing:border-box}.appShell{display:grid;grid-template-columns:240px 1fr;min-height:100vh}.sidebar{border-right:1px solid #e5e7eb;padding:16px}.brand{font-weight:700;margin-bottom:16px}.nav{display:flex;flex-direction:column;gap:8px}.nav a{display:block;padding:8px 10px;border-radius:6px;text-decoration:none}.nav a.active{background:#f3f4f6}.main{padding:20px}.topbar{display:flex;justify-content:space-between;align-items:center;gap:12px;padding-bottom:12px;margin-bottom:16px;border-bottom:1px solid #e5e7eb}.small{font-size:12px;color:#6b7280}.buttonRow{display:flex;gap:8px;align-items:center}.btn{appearance:none;border:1px solid #d1d5db;background:#fff;padding:8px 10px;border-radius:6px;cursor:pointer}.btn:disabled{opacity:.6;cursor:not-allowed}